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ppm meter question

Discussion in 'Hydroponics / Aeroponics' started by Jumpin, Jan 30, 2013.


    Jumpin Active Member

    I have a TDS-3 meter and am not sure how to read it. It states it reads from 0-9999ppm however on the screen I am getting a reading of 124. Does this mean its really 1240ppm or actually 124ppm?
    match box

    match box Well-Known Member

    I don't know that meter but I would think it's 124. Thats what my meter would and your should be the same.

    Jumpin Active Member

    That could explain why my plant looks like hell. I need to add a lot more nutrients to her res. Thanks

    Newbt Member

    mine actually shows the 3 digit number and if ppm goes into the 1000's it has a x10 blinking on the side, not sure if yours is the same but wouldn't want you to up your nutes and fry the plants before checking.

    superstoner1 Well-Known Member

    If it has 3 digit readout then, Yes,multiply by 10.

    (818)MedicineMan New Member

    The TDS-3 website shows it reads 0 - 9999 PPM. I am inclined to believe it is a four digit readout. A simple test would be to mix a small batch of nutes strong enough to get a readout over three digits and see for yourself. You can then further dilute your mix unitl you are at the right PPM.

    thatreedocta Active Member

    I agree. To check, measure distilled water (0 ppm), then tap water (around 250 ppm depending on area), and then a small glass of straight nutrients or ph up/down solution (high ppm in the thousands). By the way, im pretty sure yours means 124 and not 1240. Especially because i've never heard of a ppm meter/pen rounding instead of giving an exact measurement.

    superstoner1 Well-Known Member

    Many entry level pens have a 3 digit screen and use a multiple of 10

    GreenThumbSucker Well-Known Member

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